2008 Tioga. Fuel shut off problem?

I just checked my manual for the Onan 4000 (gasoline) generator and it has it's own fuel pump and filter inside the generator housing.

I think I can rule out water in the tank. Just before this happened, my son, who was following me in his car, stopped at the same Valero gas station and got gas, but from a different pump. However, I think the regular gas come from the same underground fuel tank. He did not have any problems with the gas. Furthermore, the generator does start and runs for about 5 to 10 minutes, then shuts off, which leads me to believe that it is not a water issue. Does the generator and engine share the same pump? If so, the pump would need to operate to fuel the generator even with the engine off...which leads me to believe the culprit might be a shared fuel filter.

cgmartine wrote:
I just bought a used 2008 Tioga class c with a ford V-10 Triton engine. While going up a slight incline on the freeway, the engine starting bucking, then quit. The generator would run then quit. I read in the owner's book that this engine has a fuel shut off which cuts off fuel in case of an accident. I was not in an accident but I suspect this may be the cause. Has anyone experience this? Is there a way to deactivate this shut off device? Thx

It's not the accident cutoff switch. Once power to the fuel pump is interrupted, it would stay that way until manually reset.
I would vote for condensed water in the fuel tank and a pick up tube that gets submerged when the tank gets tipped on a hill.

I don't think any fuel injected Ford can have genset pulling gas from the road engine's pump or lines. First, that pump's pressure would blow past the needle/seat valve in the genset's carburetor. Second, an external fuel pump (like a genset has) cannot pull gas through a high pressure (EFI) Ford pump that has failed or isn't running.

Find the fuel cutoff safety and trip/release it a couple times. Looks/feels a lot like a home circuit breaker. But I don't think it's your problem.

I would also suspect something else. I don't think they share a fuel pump since the generator won't drain the tank. I think it stops at about 1/4 tank. Bad fuel? Maybe water in the tank? It would have to be a lot of water though since the gen won't run either.

Do you have less than a 1/4 tank of gas? That would be why the gen won't run. Maybe a combination of that and a bad fuel pump, clogged fuel filter, or water in the tank if the tank is really low.

My old B would quit on hills if the fuel filter was nearly clogged. It was a really old gas tank though and I suspect it was full of crud.

Someone on another forum suggested it might be either a weak fuel pump, or a bad fuel filter. Would either of these also affect the operation of the generator? The generator gets its fuel from the gas tank, which is half full, but I am thinking that if the generator, like the engine, is starved for fuel, it may be something else.